Tip checked list box

[kavithavr]

how to change the bkcolor of checked list box checked item only in vb.net?

 

[JohnH]

You have to inherit CheckedListBox and override OnDrawItem where you custom paint the items. You use this control in form instead of the default CheckedListBox. Here is an example:

Imports System.ComponentModel
Public Class CustomCheckedListBox
    Inherits CheckedListBox

    Private _CheckedBackColor As Color = Color.Yellow
    <Category("Appearance"), Description("The background color of checked items.")> _
    Public Property CheckedBackColor() As Color
        Get
            Return _CheckedBackColor
        End Get
        Set(ByVal value As Color)
            _CheckedBackColor = value
        End Set
    End Property

    Protected Overrides Sub OnDrawItem(ByVal e As System.Windows.Forms.DrawItemEventArgs)
       
        Dim checked As Boolean = Me.CheckedIndices.Contains(e.Index)

        Dim textrectangle As Rectangle = e.Bounds
        textrectangle.X += textrectangle.Height
        textrectangle.Width -= textrectangle.Height + 1

        'back color
        If checked Then
            Using sb As New SolidBrush(Me._CheckedBackColor)
                e.Graphics.FillRectangle(sb, textrectangle)
            End Using
        Else
            Using sb As New SolidBrush(Me.BackColor)
                e.Graphics.FillRectangle(sb, textrectangle)
            End Using
        End If

        'checkbox            
        Dim boxlocation As Point = e.Bounds.Location
        boxlocation.Offset(1, 1)

        Dim checkstate As VisualStyles.CheckBoxState = VisualStyles.CheckBoxState.UncheckedNormal
        If checked Then
            checkstate = VisualStyles.CheckBoxState.CheckedNormal
        End If

        CheckBoxRenderer.DrawCheckBox(e.Graphics, boxlocation, checkstate)

        'text    
        Using sb As New SolidBrush(Me.ForeColor)
            Dim text As String = Me.Name
            If Me.Items.Count > 0 Then
                text = Me.GetItemText(Me.Items(e.Index))
            End If
            Dim format As New StringFormat
            format.LineAlignment = StringAlignment.Center
            textrectangle.Inflate(-3, 0)
            e.Graphics.DrawString(text, Me.Font, sb, textrectangle, format)
        End Using

        'focus rectangle
        Dim focused As Boolean = (e.State And DrawItemState.Selected) = DrawItemState.Selected
        If focused Then
            Using p As New Pen(Color.Black)
                p.DashStyle = Drawing2D.DashStyle.Dot                
                textrectangle.Inflate(2, -1)
                e.Graphics.DrawRectangle(p, textrectangle)
            End Using
        End If
    End Sub
End Class

 

[kavithavr]

how to change the bkcolor of checked list box checked item only in vb.net?

Thank you for the reply